Crucial v4 (256GB) Review
by Kristian Vättö on November 22, 2012 1:01 PM ESTPerformance Over Time & TRIM
I first ran HD Tach on a secure erased drive to get the baseline:
Next I filled the drive with sequential data and tortured it with compressible 4KB random writes (LBA space 100%, QD=32) for 20 minutes:
The result is rather interesting. Performance does not degrade significantly and after around 30% of the LBAs have been written to, performance is back to where it was after secure erasing.
As 20 minutes wasn't enough, I extended the length of the torture to 60 minutes:
And the graph is almost the same as after 20 minutes of torturing. The v4 seems to be doing active garbage collection, which means it tries to clean some blocks every time a write request comes in. As you can see, performance is getting better and better as the drive receives write requests and it's again back to brand new state after ~75GB of writes.
FInally I TRIMed the drive:
There are a few odd drops but overall write speed is what it should be. The drops are most likely related to internal task scheduling. A sent TRIM command does not mean that the drive will automatically exceute it as the controller may prioritize some other task, which leads to a scenario where all blocks are not cleaned.
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andrejg - Tuesday, November 27, 2012 - link
For my HP635 notebook with AMD E450 chipset/platform. It turned out, that it is incompatible with notebook. Tried all kinds of tricks, from FW updates/upgrades... SSD just sometimes , not allways, didn't work properly at boot, showing boot sector problems and errors. The same SSD works very good in a desktop. Anyway, it is priced too high to be worth considering, since you can get Intel 330 or Samsung 830 for couple of euros more, but with much much higher speeds and with latest SATA speed.Oh, and before giving up I really spent many days in front of google, forums, support pages from HP and Crucial etc. What is funny is, that this very HP635 is stated as supportedfor a v4 128 on a Crucial web site...
jack.fxx - Tuesday, November 27, 2012 - link
The SSD you bought is probably faulty and you should ask for replacement. Even if it's not faulty, it still doesn't work as specified.batguiide - Sunday, December 9, 2012 - link
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legalsuit - Wednesday, October 23, 2013 - link
So I bought a Crucial v4 128gb to use in my PC laptop. It was slower than the hdd, so I moved it to a desktop... still too slow... then finally as a last ditch effort, I threw into an old 2006 Mac Book Pro (A1150). Wow, it worked perfectly.Just goes to show. Old tech and old tech make a happy marriage. And don't get this if you have anything newer, just won't work right.